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Method for extracting humus from pig manure maize straw compost

A corn stalk composting and humus technology, which is applied in fertilization devices, fertilizer mixtures, organic chemistry, etc., can solve the problems of unsatisfactory extraction effects and achieve high extraction efficiency

Inactive Publication Date: 2015-06-03
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the unsatisfactory extraction effect of humus in pig manure and corn stalk compost in the prior art, the present invention provides a method for extracting humus in pig manure and corn stalk compost, comprising the following steps:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Add 100mL extract solution to 10g compost sample, the extract solution is 0.1M NaOH and 0.1M NaOH 4 P 2 o 7 Mixed at a volume ratio of 1:1, shake at room temperature for 2 hours, then centrifuge at 5000rpm for 20 minutes, extract the supernatant, and remove the filter residue.

[0019] 2. Acidify the supernatant with 6M hydrochloric acid to pH = 1, stir it well, let it stand overnight at room temperature, then centrifuge at 5000rpm for 20 minutes, collect the supernatant and precipitate respectively, and compare the above The supernatant was freeze-dried to give 0.32 g of FA, and the precipitate was freeze-dried to give 1.14 g of HA.

Embodiment 2

[0021] 1. Add 120mL extract solution to 10g compost sample, the extract solution is 0.1M NaOH and 0.1M NaOH 4 P 2 o 7 Mixed at a volume ratio of 1:1, shaken at room temperature for 3 hours, then centrifuged at 4000rpm for 30 minutes, extracted the supernatant, and removed the filter residue.

[0022] 2. Acidify the supernatant with 6M hydrochloric acid to pH = 1, stir it well, let it stand at room temperature overnight, then centrifuge at 4000rpm for 30 minutes, collect the supernatant and precipitate respectively, and compare the above The clear was lyophilized to obtain 0.25g FA, and the precipitate was lyophilized to obtain 1.10g HA.

Embodiment 3

[0024] 1. Add 150L extract solution to 10g compost sample, the extract solution is 0.1M NaOH and 0.1M NaOH 4 P 2 o 7 Mix at a volume ratio of 1:1, shake at room temperature for 4 hours, and then centrifuge at 6000 rpm for 15 minutes to extract the supernatant and remove the filter residue.

[0025] 2. Acidify the supernatant with 6M sulfuric acid to pH=1, stir it well, let it stand at room temperature overnight, then centrifuge at 6000rpm for 15 minutes, collect the supernatant and precipitate respectively, and The supernatant was freeze-dried to give 0.3 g FA, and the precipitate was freeze-dried to give 1.0 g HA.

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Abstract

The invention relates to a method for extracting humus from the pig manure maize straw compost. The method comprises the following steps: (1) adding the pig manure maize straw compost into an extracting solution, performing vibrating extraction for 2-4 hours at room temperature, centrifuging and removing the filter residue to obtain a supernate for later use, wherein the extracting solution is obtained by mixing 0.1M of NaOH and 0.1 M of Na4P2O7 according to a volume ratio of 1:1; and (2) adjusting the pH value of the supernate to 1, fully stirring, standing overnight at room temperature, centrifuging, collecting the supernate and the precipitate to respectively obtain the fulvic acid FA and the humic acid HA. The method for extracting the humus from the pig manure maize straw compost provided by the invention is high in efficiency and extraction ratio and is an effective extracting method with strong pertinency.

Description

technical field [0001] The invention relates to a method for extracting humic acid, in particular to a method for extracting humus from pig manure and corn stalk compost. Background technique [0002] Humic substances (HS) are a class of organic substances formed by chemical and biological decomposition and reaction of animal and plant residues under complex geological conditions. It is present in almost all environments such as soil, water bodies (oceans, lakes, rivers) and sediments. According to its solubility under different pH conditions, it can be divided into: humic acid, also known as humic acid (Himicadd, HA is soluble in alkali and insoluble in acid), fulvic acid (fulvicacid, FA is soluble in alkali and acid), humin (humin, Hu, insoluble in acid and alkali). [0003] Agricultural composting can be divided into two stages: activation and solidification. The first stage is intense microbial activity, and microorganisms decompose most of the degradable substances; t...

Claims

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Application Information

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IPC IPC(8): C08H99/00C07G99/00C05G3/00
Inventor 孙向平李国学肖爱平时红王熠明李扬阳
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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